Tall boy's and LD

I swear I read a article about a Learning Disability that was a genetic type thing, but for the life of me I cant find that artcile or the name of the malady that I think my son has. He has some LD"s that are being addressed, but I keep thinking there is something else going on in that brain of his. I read this article in a magazine (cant remember which one) and it was describing my son to a tee. Does anyone know what the name of the condition is or where I can look it up? Any help would be appreciated.